Signaling system



Sept. 1924. 1,507,905

I w. E. BEATTY SIGNALING SYSTEM Filed Nov. 6, 1917 f I /m/e/7/0/ z WM/Mm .5. Bea/7y.

Patented 19 24. p

v. v 1,5 1,905 Y UNITED *ST A'T-ss PATENT, OFFICE...

wmux a. 3mm, '0: na asmn,- nnw yonx, Assienon 'ro wnsrm npncrmc 100mm, mconronarnn, or NEW YORK, 11. 1,1 CORPORATION or Maw-roan.

8IGNALING mm.

Application iuea Iovember a, 1917, Serial No. 290,493.

To 'aZZ iolwm my concern: 4

Be it known that I, WILLIAM a citizen of'the United States, residing at Bayside, Long Island, in the county of Queens and State. of New York, haveinvented certain new and useful Improvements in Signaling Systems, of which -the following is a full, clear', concise, and exact description. 1

The present invention relates to a signaling system in' which modulated high fre-' quency carrier currents are employed for transmitting the messages through space or over wires and the invention especially remodulation or modification of the carrier wave in accordance'with the signals. I

page I45 et s of'a publi- Miessner on As described. cation written by sending station acarrier-wave modulated in.

- such a manner that it is possible to use, at

. the receiving station, apparatus which is highly responsive to the wave transmitted at its corresponding signaling station, but

is unresponsive to waves from other sources.

' ing another carrier wave of lower frequency.

accordance with a mod The sending station described in theabove named publication employs one' generator for supplying a carrier wavehaving .a high frequency and another generatorfor supplyfrequency, and-the output circuit of. the sec ond detector containing the'audible signal-' ing frequency The use at thereceiving station of two high frequency circuits tuned to different freq'uencies isconducive to-high selectivity. 1 i I .In this specification a wave transmittedby thevMiessner and similar willbe termed a doublyimodulated .wave in order todiflerentiate it from a wave of a single carrier frequenc modulated in the ordinary manner. It is a possible to obtain a doub- E. Bna'rrr,

adiodynamics, it is very desirable to obtain at. the,

1y modulated wave by means of two vacuum tubes connected in tandem as described in British Patent 146,988.

An objectof he present invention is'to provide a system in which a single modula;

tor is employed 'for effecting the double modulation. This ma be accomplished by means of a vacuum tu e of the audion type-n A carrier wave of high frequency is supplied to the tube and is transmitted with an efficiency'which depends on the impedance in the tubecircfiit. The carrier. wave of low frequency is also supplied to the tube 1f only these two sources of waves were'present theresult would be that the high carrier 'frequency' would be modulated with the low ever, controls the efiect'of the waves of lower carrier frequency, and the waveof higher carrier-frequency is accordin l modulated in accordance with the wave 0% o frequency,.the latter being in turn modulated by the signal. Incidentally the signaling device serves 'to modulate the carrier waves individually as well as collectively so that there are (Present singly as well as douby modulate waves.

Some of the. s stems which may. be employed for carrying out the present invention are shown in' the drawings, in which Fig. 1, illustratesa modulating system in which" both sources of carrier waves are carrier-frequency. .A signaling device, howwer carrier supplied to the input circuit ofthe modulator. v

Fig. 2. is a modification'of Fig. 1 wherein one carrier wave generator is associated with the input circuit, the other carrier wave generator being'associated with the output circuit of the modulator,

3 is another modification in which both carrier wave generators are associated with the output circuit of the modulator.

In Fig. 1, f and f are suitable generators of high and com aratively lowcarrier frerespectively. These two quencles F and "generators'are "connected to the input circuit of the vacuum tube modulator 1 ofthe audion In case it'is desiredto transmit telephonic rather than a telegraphic signal, acircuit comprising the transmitter f1 and battery 5 type by means of the transformers -2 and 3 respectively.

may be coupled to the input circuit of the vacuum tube 1 bymeans' of the transformer 6. The output circuit of the vacuum tube 1 contains the usuaI im dance 7 space current battery 8, and con enser 9 for shuntingthe high frequency currents around the battery 8. The output circuit of he modulator 1 also includes the circuit L which is tuned either to the frequency F i-F 13 or F F iS if the doubly modulated wave isto be transmitted. If a singly modulated wave is to be transmitted, however, then the circuit LC is tuned to either the frequency F 'i-s or F,:S.,

If the doubly modulated wave is transmitted,

it may be desirable to choose for F and F values such that the sharpness'of tuning of the circuit LC will permit that substantially *none of the singly modulated wave will be also transmitted. The circuit LC is coupled to-a suitable sending conductor such asthe" antenna circuit 10.

Fig. 2 illustrates a modification in whichv one of the generators f, or f,,, it matters not which, is coupled to the output circuit ofthe tube 1 by means of the transformer 11. The other generator is coupled to the input circuit as shown.-

In Fig. 3, generators f and f, are both coupled to the output circuit of the tube 1 by means of the transformers 12 and 13 ncspectively.

In case, the doubly modulatedlwave is transmitted the sending stations shown in Figs; 1, 2 and 3 are adapted to be used in connection with a receiving system employ-- ing two detectors in tandem, for instance as ililown and described in the publication by 85 ies'sner to; I

What is claimed is: p I I. A signaling system comprising means for supplying high frequency waves, means for supplying other high frequency waves of different characteristic, means .for modulating said first mentioned waves in accordancewith a signal, said modulating means also serving to modulate saidother on Radiodynamics above referred wavesin accordance with the (first mentioned modulated waves, a transmitting con- 7 cluctor, and means for impressing \the said modulated waves on said transmitting conductor, at least one of thesaid high frequency waves will not be impressed on the-transmitting conductor. v

2. A signaling systemromprising means for supplying waves, means for supplyin other waves of difi'erent frequency, an means for modulating each of said waves in accordance with the signal, said modulating means being in common to both of said supplying means and coupled with a transmitting conductor.

t 3. A signaling system comprising means for supplying waves, separate means for sup- .plyin other ,waves,-and a vacuum tube device or simultaneously modulating each of said waves in accordance with a signal.

said means being so positioned that diflerent frequencies mteractiliiis beats, meansfor simultaneo 4. A signaling system' comprising means' for supplying waves, means for-supplying other waves, having a different characteris tie, and a vacuum tube device for modulating individually and collectively the-waves derived from said supplying means.

for 'supplyingwaves ofrelatively high frequency, means for supplying waves of rela-' tively low frequency, and a vacuum tube of 5. A signaling system comprising means I the audion type for mqglulating said; waves of both frequencies in accordance witha s1 nal, said vacuum tube also serving to mo ulate said waves of high frequency in accordance with the modulated waves of low frequency. a.

6. A- signaling system comprising means for supplying waves of high frequency,

means for supplying Waves of low irequency,-means formodulating said waves of low frequency in accordance with a signal and for modulating said waves of hi h free quen'cy in accordance with the mo ulated lower frequency waves, and a transmittin conductor energetically associated with sai modulating means and so positionedthat at least one of said high frequency waves is not impressed by a source on said conducton.

between two of said means, for modulating each of said waves-1n accordance with a s1gnal, and a transmitting conductor coupled. v

with the circuit which includes one of said means.

9. "A signaling system comprising a plurality of sources of high frequency waves, a

vacuum tube device between two of said sources for modulating the waves derived therefrom,-and a signalin device associated with said tube "for 'control in said waves. 1Q. A vacuum tube of t e audion ty having an input circuit and source ofsignal current for rp y p tential" variations to said in ut circuit, a

an output cir- I cuit, an alternating current generator anda' source of direct current in said output cir-I cuit, and means for supplying an alternating current to said output circuitof different frequency than that supplied by said altem natmg current generator.

11. Transmitting apparatus comprising means for producin electric currents of to produce ing the amplitudes of said currents in ac cordance with a signal or message, and means for impressing the beat energy upon a transmitting medium;

12. The method of impressing upon a transmitting medium electrical energy reps resenting a signal or message, which consists in producing electric currents of different frequencies interacting to producetransmitting medium electrical energy rep-.

resenting a signal or message, which consists in producing .electric currents of different frequencies interacting to produce beats of inaudible. frequency, simultaneously changing the amlitude of. said currents in accordance wit the signal or message to be sent, and impressing the beat energy upon the transmitting medium.

15. In a signaling system, means for ro-- ducing a' signal current, an interme 'ate frequency current. and a high frequency current, means for modulating the inter-' mediate and the high frequency currents according to the signal current, and means for simultaneously modulating the high frequency current according to the intermediate modulated current.

16. In a signaling system, means for producing a high frequency current, means for producing a signaling current, means for modulating the high frequency current di-* rectly in accordance with the signaling current, and means for modulating the high fr of t e signaling current- 17. In combination, means for producing a carrier current, and means for va a characteristic of the carrier current in two distinct ways either of which may be uti lized independently of the other for reproduci the same sound.

18. n combination, means for producing a carrier current, means for characteristic of the carrier current 111 two rent, varying uency current indire'ctly'as a function distinct-ways, one of which may be utilized for reproducing a signal by a single detection and the other of which ma be utilized for reproducing a signal by p ural detection.

19. The method of signaling. which comprises producing a signal current, an intermediate frequency current and ahighfrequency current, modulating the intermediate'and high frequency currents accord ing to the signal current, and simultaneously modulating the high frequency curlated current.

20. The method of signaling which c mk prises causing a plurality-of distinct but simultaneous series of variations-in a carrier current. by a single signal.

2] The method of signal transmission whichjcomprises producin abarrier' cura characteristic of the carrier current in a plurality of distinct ways in accordance with sound, any of which may be .utilized to reproduce the' same sound at another station.

22. In combination, means for producing a carrier current, a single source of modulating waves for varying said current, and means whereby said source varies a characteristic of the said current in two distinct-ways, either of which may be 'utilized independently of the other for receiv ing the same signal.

23. A system comprising a source of relatively high frequency waves or impulses, a source of relatively low frequency waves, and-means whereby the waves or impulses produced from said first mentioned source are caused to vary in amplitude in two distinct wa s, either of which may be utilized xindepen ently of the other to reproduce waves -similar to those from said second mentioned source.

24. A system comprising a source of periodic energy of relativel high fre nency, a second source of erio ic energy having a relatively low equenc and means whereby the energy produced by said first mentioned source 1s caused to vary in intensity in a plurality ofdistinct ways, any one of which may be utilized to reproduce periodic energy similar to that produced by said second mentioned source.

In witness whereof, I hereunto subscribe 111a7name this 31st day of October A. D.,

E. BEA'ITY.

70 rent according to the intermediate modu- 

